—How did the fire_____?
--By a car accident.
| A．come about | B．come on | C．come to | D．come over |
___ difficult the task may be, we must fulfil it this month.
| A．No matter how | B．No matter what | C．No matter when | D．No matter where |
“_____ when does the pub stay open？” “About midnight.”
| A．Since. | B．Before |
| C．Until. | D．After |
___you understand this rule, you will have no further difficulty.
| A．Once | B．At once | C．Only | D．Only then |
“Shall we stop for lunch _____ shall we drive on？” “Let’s stop for lunch, but the driver can’t drink _____ drive.”
| A．and, and | B．or, or |
| C．and, or | D．or, and |
____ you work, you must always serve the people heart and soul.
| A．Wherever | B．Whenever | C．Where | D．When |